Question

1. how is oxygen carried from the lungs to the tissues? it is carried by cilia through the bronchioles. it binds to a protein called hemoglobin in red blood cells. it leaves the alveoli and enters mucus. it leaves the bronchi and enters capillaries.

Explanation:

Oxygen diffuses from alveoli into the blood in the capillaries surrounding them. In red - blood cells, it binds to hemoglobin, a protein with a high affinity for oxygen. This oxygen - hemoglobin complex is then transported to the body's tissues where oxygen is released for cellular respiration. Cilia in bronchioles are mainly for moving mucus and debris, not for oxygen transport. Oxygen does not enter mucus for transport, and it is the alveoli (not bronchi) where gas exchange with the blood occurs.

Answer:

It binds to a protein called hemoglobin in red blood cells.